(BBC) -- The Vatican has opened its doors for its annual exorcism course amid increasing demand among some of the world's Catholic communities.
As many as 250 priests from 50 countries have arrived in Rome to learn how to identify demonic possession, to hear personal accounts from other priests and to find out more about the rituals behind expelling demons.
Exorcism remains controversial, in part due to its depiction in popular culture and horror films. But there have also been some cases of abuse linked to exorcisms in a range of religious sects.
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